使用HtmlAgilityPack确定字符串是否包含允许标记列表中的ONLY标记

时间:2013-12-14 09:25:34

标签: c# html-agility-pack

cf / Finding HTML strings in document和类似的问题。

我已经看到了使用HtmlAgilityPack来解析查找特定标记的字符串的示例,但是如果我想确保输入字符串仅包含列表List<string> AllowedTags中的字符串呢?

换句话说,我如何迭代doc.DocumentNode.Descendants来识别标签名称并检查它是否在列表中?

2 个答案:

答案 0 :(得分:3)

var allowedTags = new List<string> { "html", "head", "body", "div" };

bool containsOnlyAllowedTags =
         doc.DocumentNode
            .Descendants()
            .Where(n => n.NodeType == HtmlNodeType.Element)
            .All(n => allowedTags.Contains(n.Name));

答案 1 :(得分:2)

List<string> AllowedTags = new List<string>() { "br", "a" };
HtmlDocument goodDoc = new HtmlDocument();
goodDoc.LoadHtml("<a href='asdf'>asdf</a><br /><a href='qwer'>qwer</a>");
bool containsBadTags = goodDoc.DocumentNode .Descendants()
                                            .Where(node => node.NodeType == HtmlNodeType.Element)
                                            .Select(node => node.Name)
                                            .Except(AllowedTags)
                                            .Any();
HtmlDocument badDoc = new HtmlDocument();
badDoc.LoadHtml("<a href='asdf'><b>asdf</b></a><br /><a href='qwer'>qwer</a>");
containsBadTags = badDoc.DocumentNode   .Descendants()
                                        .Where(node => node.NodeType == HtmlNodeType.Element)
                                        .Select(node => node.Name)
                                        .Except(AllowedTags)
                                        .Any();